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I just learned something wonderful today. I always thought a "jiffy" was just a term meaning "a short time". I use it all the time. I never knew that it actually means the period of time between alternating power cycles (so 1/50 or 1/60th of a second)
"In computing, a jiffy is the duration of one tick of the system timer interrupt. It is not an absolute time interval unit, since its duration depends on the clock interrupt frequency of the particular hardware platform."
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I've been an electrical engineer for over 30 years, and never heard the term "jiffy" applied to the period of an ac current cycle before. It hertz to think about it, so a citation is definitely needed.
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